23 mm caliber is a specific size of popular autocannon ammunition.

This ammunition size has been widely used in many conflicts worldwide. Examples of armaments using it are:

• 23×115mm caliber, used on many Soviet and Russian airplanes
• 23×122mm^[1]
• 23×139mmSR
• 23×152mmB caliber, used on Ilyushin Il-2 attack plane as well as on later Soviet anti-aircraft guns
• 23×260mm caliber, telescoped ammunition used on the Rikhter R-23 autocannon^[2]

• 12.7×99mm
• 12.7×108mm
• 14.5x114
• 20 mm caliber
• 25×137mm
• 40 mm grenade
• Bofors 40 mm gun
• List of cartridges (weaponry), pistol and rifle

This article includes a list of related items that share the same name (or similar names).
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